We learn from the text that corals depend on plants for ______.

A．Some animals and plants depend on each other for existence.
B．Some animals and plants develop their relationship easily.
C．Some plants depend on each other for food.
D．Some animals live better together.

A．the second largest continent in the world
B．a dangerous and unpleasant insect
C．farmland in the heart of Africa
D．a kind of illness that can destroy cattle